# Work energy and heat relationship questions

### Using the work-energy theorem in thermodynamics - Physics Stack Exchange

The relationship between the pressure, volume, and temperature for an ideal gas is given by . Heat and work are both energy in transit—neither is stored as such in a system. . Solving Problems Involving the First Law of Thermodynamics. Lesson 2 - The Work-Energy Relationship of Situations in Which Mechanical Energy is Conserved · Application and Practice Questions · Bar Chart Illustrations . Thermodynamics Part 1: Work, Heat, Internal Energy and Enthalpy Energy - The potential energy stored in the electrostatic bonding relationships among or energy transfer, this definition makes it possible to solve many practical problems .

## Application and Practice Questions

There is a relationship between work and mechanical energy change. Whenever work is done upon an object by an external or nonconservative forcethere will be a change in the total mechanical energy of the object. If only internal forces are doing work no work done by external forcesthere is no change in total mechanical energy; the total mechanical energy is said to be "conserved. Check Your Understanding Use your understanding of the work-energy theorem to answer the following questions.

Then click the button to view the answers.

### Thermodynamics Part 1: Work, Heat, Internal Energy and Enthalpy

Consider the falling and rolling motion of the ball in the following two resistance-free situations. In one situation, the ball falls off the top of the platform to the floor.

In the other situation, the ball rolls from the top of the platform along the staircase-like pathway to the floor. For each situation, indicate what types of forces are doing work upon the ball.

Indicate whether the energy of the ball is conserved and explain why. Finally, fill in the blanks for the 2-kg ball.

### thermodynamics - What is the relationship between entropy and work? - Physics Stack Exchange

See Answer The only force doing work is gravity. Since it is an internal or conservative force, the total mechanical energy is conserved. The recovery of waste heat from the exhausts of vehicle engines for example is an active research topic.

The 'end of the road' is still low level thermal energy. What do we mean by 'system' here? In defining the system we are necessarily excluding interactions with some objects which are collectively termed the environment.

## What is thermal energy?

If thermal energy is transferred to the environment then energy will no longer be conserved in the system. Our article on conservation of energy further explores this concept. Thermal energy from friction Consider the example of a man pushing a box across a rough floor at a constant velocity as shown in Figure 1. Since the friction force is non-conservativethe work done is not stored as potential energy. All the work done by the friction force results in a transfer of energy into thermal energy of the box-floor system.

This thermal energy flows as heat within the box and floor, ultimately raising the temperature of both of these objects. Man pushing a box opposed by friction.